Many-Times Method for Authentication(The Proposed Scheme is Perfect Secure if We just Login to the Server One Time)

Internet

WWW

Server

1st time challenge

Challenge image #1

key image

1st time response / PW : 12345

2nd time challenge

Challenge image #2

2nd time response / PW : ABCDE

• The (2, 2) VSS scheme is a one-time-password

like scheme

• The more challenge-password pairs the intruder

gets, the more information will be leaked

source

destination

interception

Challenge #1 + Challenge #2

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